| The amount of non-current prepayments and non-current accrued income including non-current contract assets. [Refer: Prepayments; Accrued income including contract assets] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Total non-current prepayments and non-current accrued income including non-current contract assets | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Non-current prepayments and non-current accrued income including non-current contract assets | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |